iOS5 is the latest of the operating system for devices such as iPad, iPhone, and iPod Touch.  Upgrading your old iPhone or other apple mobile devices into iOS5 will not guarantee the users free of defects. There is a major leap from 4 to 5 with the latest of specs and features for the OS, that is why it is always a rule of thumb to wait for 5.1. This will be a better choice since whatever problems that surfaced in the iOS5 will be straightened out. Some of cool features of iOS5 are:

1.    iMESSAGE. Text, photos, videos, contact and location messaging between 2 apple devices is free. Group messaging is enabled as long as all devices are connected to wifi or 3G.
2.     NOTIFICATION CENTER. All notification comes into one place, with a selection of notification types like banner notifications, classic pop-up notifications, or no notification???
3.   TWITTER. For that twitter-addict, there is already integration into iOS5. New Tweet sheet supports multiple accounts for photos, camera, maps, youtube, and safari.
4.     PHOTOS.Built-in photo editing app.
5.     iCloud, if you know what it means then it is included.
6.     NEWSSTAND. All-in-1 display of your favorite magazine and newspaper app subscriptions.
7.     REMINDERS. Nothing new and not a super-updated application for smart phones.
8.     CAMERA. From the lock screen, you can use the camera app for unexpected moment.
9.    SAFARI. A new world of safari interface is presented. An update into the iOS5 will bring the experience you haven’t felt from the previous browser.
10.   PC FREE. Without connecting to your computer, you can update, download, upload anything into iCloud. No mess anymore.